Re: Flush Type Finishing Washer Used on Tail?

Richard Thomson


    Yep, working in the baggage bay is a pain literally.  There is a picture somewhere of Sam I believe it is, curled up in his baggage bay looking comfortable working on his controls.

    I am lucky if I can get half way in these days as the joints are not as supple as they used to be, and no longer the skinny apprentice that 45 years ago used to get sent up the Gazelle tailcone to fit the cables up the fin.

    I agree, you have to be careful with power drivers and always start the screw first. Taking my cowls off or on by hand is about 10 times longer than with the PD. My PD like most these days have a variable torque feature so easier to see if the screw locks up and just check tight when finished by hand.  If you go out on the line today, most mechs have a PD in their kit. Otherwise how would they meet the 90 minute turn around. :-)


    Rich T.


On 14/02/2022 18:55, smeshno1@... wrote:

 This is a major issue with the replaceable element floating nutplates (used on Gulfstream wing fairings for example). Don't push too
hard on installation.  The shop techs at IAI (Israel Aerospace) in Tel Aviv were complaining to me about the nutplate design when running in the stainless screws on the fairings with a power driver. I was polite but firm about the preferred process. In the States we use speed wrenches once the screws were in 2 or 3 turns by hand..therefore verifying the threads are not crossed.  Engineering Change Request: Rejected!    
 Rich, good catch and you are correct on the stainless into cadmium plated nutplate..the galling of the threads is a concern between the two metals. Its why we used candle wax on the screw threads and install slowly to final torque. I personally have never used power drivers to install
on my own or other owners aircraft. 

 Speed wrenches are not really so speedy in this case, nor should they be! Chris already found out how much "fun" it is to get into the aft 
fuselage with a galled-in screw (from rust in his case).  What first is an easy task ends up being a major pain repair.  


From: <> on behalf of Richard Thomson <richard@...>
Sent: Monday, February 14, 2022 4:10 AM
To: <>
Subject: Re: [Q-List] Flush Type Finishing Washer Used on Tail?

Hi Corbin,

Take care if you are using stainless screws with standard anchor nuts and you use a power screwdriver. They can seize and damage the nut or the mounting rivets.

I use a slight smear of anti seize on the thread to lubricate those regularly removed like my cowling screws, it still has enough friction to lock the screw.

Rich T.

On 13/02/2022 21:55, Corbin via wrote:
On Sat, Feb 12, 2022 at 11:30 PM, Richard Gammon wrote:
Thanks Richard.  I placed an order with Aircraft Spruce a few days ago so I am hoping they are the right ones.  They have a warehouse close to my house so I typically receive orders with a day or two, at most.  I hate their shipping costs though and try to order from other sources as much as possible.


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